Pitt plays The Vanisher for a grand total of about 3 seconds of screen-time, at the climax of the mission that goes to hell and sees all of Deadpool's new recruits - with the exception of Zazie Beetz's Domino - killed off spectacularly in a sort of loving tribute to FInal Destination's colourful kills.
Thanks to 'Pool ignoring a wind warning and insisting the mission - which begins with the parachute jump - goes ahead, the fledgling hero group is blown off track and end up scattered. Bedlam is hit by a bus, Shatterstar hits a helicopter and is shredded, Zeitgeist lands in a wood chipper and Peter ends up being melted by Zeitgeist's acid vomit when he goes to help him. It's a great sequence, but it's crowned by the sight of The Vanisher hitting a power line.
At that point, we get to see Brad Pitt lit up like a Christmas tree as he dies by electrocution and it's just an incredible moment in a movie full of great gags and fan-baiting Easter Eggs and cameos.
And imagine a world where a Hugh Jackman cameo in a Deadpool movie wouldn't be the best thing about it...